Grinding machine



IIHIII CCL 6, 1931. C, W HOPKlNS 1,825,797

GRINDING MACHINE Filed Feb. 15, 1930 2 Sheets-Sheet l Slm/vento@ Oct. 6, 1931. C. W. HOPKINS `1,825,797

GRINDING MACHINE Filed Feb. l5, 1930 Z'SheetS-Sheet 2 Patented Oct. 6, 1931 UNITED STATES PATENT OFFICE CECIL W. HOPKINS, OF CINCINNATI, OHIO,`

INCORPORATED,- OF CINCINNATI,

`AssIefNon To THE omcnma'rr onmnnns omo,

A. CORPORATION OF OHIO Gambino MACHINE Application led February 13, 1930. Serial No. 428,172.

This invention relates to` improvements in machine tools and especially to improvements in grinding machines of the centerless type.

An obj ect of the invention is to provide improved means for effecting an ejection of the work piece `from the grinding throat of a centerless grinder.

Another object of the invention is to pro' vide an4 improved positioning member combined with an hydraulic ejector for initially positioning and subsequently ejecting a work piece from the grinding throat of a centerless grinder that may be manually operated for independently ejecting work be coupled up wlth a movable member of the l assembly to automatically eject the work Figure 1 is an elevational view ofa ma- Y' chine embodying the improvements of this arrow on its housing at rate of speed. The regulating wheel is likeinvention.

Figure 2-is a sectional view taken on line 2-2 of Figure 1.

Figure 3 isa'fragmentary rear elevational view showing a modification of the invention as seen from line 3-3 of Figure 1.

Figure 4 is a fragmentary sectional view of certain parts shown in Figure 3.

Throughout the several views of the drawings similar reference characters are employed to denote the same or similar parts.

lA device embodying the improvements of this invention may comprise a bed 10 having mounted thereon a slide 11 supporting the regulating wheel unit 12 rotatably supportingregulatingkwheel 13. The bed 10 1n addition supports\the grinding wheel unit 14 having the grinding wheel 15 carried thereby. The grinding wheel is adapted to be rotated in a clockwise direction as indicated by the a high or grinding pieces or may v wise rotated in a clockwise direction at a rel atively slow or work controlling rate of speed. The opposed active surfaces of the grinding and regulating'wheelstravel in opposite directions and form a grinding throat therebetween. The inner en d of the lower slide 11 has-secured'thereto a block 17 supporting a zvork rest blade 18 having an active inchned OP lating wheel. The block 17 has mounted on opposite sides thereof suitable guide brackets 20 for guiding a workpiece when being introduced into the grinding throat.

Heretofore mechanical means have been provided for positioning 'the work piece 21 relative to t e grinding and regulating wheels and for ejecting same from the grinding throat. It is one of the purposes of this application to provide hydraulic means for e ecting the ejection of the work piece and .cooperating-wlth a` positioning member 'to properly position a work piece within the grlnding throat. To this end block 1.7 has secured to its rear face a bracket 22 supporting an hydraulic cylinder 23 in which a piston"24 is adapted toibe reciprocated. A1pis'- ton rod 25 extends from the piston and has a threaded bore centrally thereof receiving the positionin and ejecting pin 26. A spring 271s enclose within the cylinder 23 and abuts on one end with the forward wall 28 the other end with the Y of the cylinder and on piston 24. The piston 24 may be of any desired construction but as here shown is of the cu j leather ty e having the flexible head 19 inclining inthe direction of the regu- I Sli 29 to ug the wal s of the clyflinder and preventleakage. The'end of t e cylinder 23 is closed b a sleeve plug 30 and the cylinder is provi ed with a port 31 receiving a flexible hose coupling 32 from which the flexible hose or conduit 33 extends. A lling port 34 is provided in the cylinder opposite to the port 31 and is controlled b spring loaded check valve 35 enclosed wit 'n the valve cage 36 carried by the cylinder 23 and the cage 36 is provided with a llng port or openin 37 through which an hydraulic medium suc as oil or the like may be introduced within the chamber'50 of the cylinder -23A behind the piston 24 the sleeve plug 20 and exible hose or conduit 33. The block 17 carries on its forward face a bracket 40 supporting a pum cylinder 41 having a port 42 'therein in w ich a coupling 43 is secured. The coupling 43 connects the flexible hose or conduit 33 with the interior of the cylinder 41. A pump piston 44 similar to piston 24 is enclosed within the cylinder 41 and has secured thereto flexible cup leather valve member 45 adapted to hug the inner wall of the said cylinder 41 and prevent leakage therein. A cap 46 is carried by the outer end of the cylinder 41 and provides a bearing through which piston rod 47 slides. The piston rod 47 is secured to the pump piston 44 on one end and carries on its other end a suitable knob or the like 48 forming one abutment for a spring 49 which abuts on its opposite end with cap 46. With the parts shown in Figure 2 the interior of piston 41 is filled with the same hydraulic medium within the chamber 50 of cylinder 23 and flexible hose of conduit The operation of the structure this far described is as follows:

Assuming that a work piece has been completed and it is desired to remove same from the grinding throat the regulating Wheel is retracted from its operative position and a push exertedv on the knob 48 causing piston 44 to travel through the cylinder 41 to discharge the h vdraulic 'medium therein through the port 42 through the conduit 33 into chamber 50 for forwardly urging piston 24. Piston 24 forceably aetuates ejector pin 26 to rapidly and forcefully eject a work piece from the grinding throat. This movement of knob 48 and piston 24 compresses springs 49 and 27 so that as soon as the urge is removed from knob 48 these springs expand to return the parts to their normal position as shown in Figure 2. While in this position the pinl 26 acts as a stop to limit the insertion of a work piece within the grinding throat. The end of the sleeve of sleeve plug 20 acts as a stop to limit the reverse movement of piston 24 and insures the active point of stop or positioning member 26 returning at all times to the same position so that successive work pieces are properly positioned relative to the grinding and regulating wheels. To vary the effective position of the end of pin 26 it is pro vided with threads 51 received within the thread bore of piston rod 25 and locking in this position bv lock nut 52.Y

In the modification disclosed in Figures 3 and 4 the pump mechanism is mounted on the rear of the regulating unit 12 and comprises a bracket 53 containing the piston puntp 45 and associated mechanisms terminating in the knob 54. This knob instead of being actuated manually as is the knob 48 is adapted to be eng d by actuator 55 having a split collar 56 lntegral therewith and clamped in position by clamp screw 57 extending between ears 58 and 59. The actuator 55 is secured to the hub 60 of a sleeve nut to which the infeed lever 61 is secured by a similar clamping means comprising lugs 62 and 63 throng i which clamp bolt 64 extends. The sleeve nut 60 engages the threads of screw 66 having on the end thereof hand or pilot wheel 67 normally used to adjust the position of regulating wheel unit 12 and regulating Wheel 13 relative to the grinding wheel.

When it is desired to actuate the regulating wheel toward the grinding wheel to feed a work piece against the grinding wheel and to retract the same the lever 61 is actuated from the position shown in dotted lines in Figure 3 through an arc of substantially 90 and returned whereupon the lever is further actuated to the position shown in full lines in Figure 3.' During the last part of the movement of the handle after the regulating wheel unit has been retracted a suiiicient distance from the grinding wheel to release the work the actuator 55 engages the knob 54 of pump piston to actuate the piston thereon through the cylinder to expel the hydraulic medium therein and eject a work piece from the grinding throat as was above described. Springs 27 and 49 are thereby compressed and upon release-0f the actuating pressure from the lever 61 they expand to return the said lever to its normal position shown in dotted lines in Figure 3 and return the pump piston and ejector piston to their normal positions.

What is claimed is:

l. In a device of the class described the combination of a pair of opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade within the throat, a positioning and ej ecting member within the throat for limiting the insertion of the work piece therein and for axially ej ecting same therefrom and hydraulic means for actuating the said member including an intermittently operable pump.

2. In a device of the class described the combination of a pair of opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade within the grinding throat, a positioning and ejecting member within the throat for limiting the insertion of a work piece therein and for axially ejecting same therefrom, a piston carried by the member, a cylinder for the piston and hydraulic means including a manually operable pump for actuating the iston to correspondingly actuate the memr for ejecting the work piece from the throat.

3. In a device of the class described the combination-of a pair of opposed grinding and regulating wheels forming grinding throat therebetween, a work rest blade Within the grinding throat, a positioning and ejecting member within the throat for limitlng the insertion of a work piece thereln and for axially ejecting same therefrom, a piston 1341 piston, .hydraulic means including ly actuable pump for actuating t respondingly to their normal position,

a cylinder for the a manual.- e piston to correspondingly actuatethe member for ejecting the work piece from the throat andn yielding means for returning the member and piston to their'normal position,

4. In a device of the class described the combination of a pair of opposed grinding and'regulating wheels forming a grinding throat therebetween, a work restblade within the grinding throat, a positioning and ejecting member within the throat for limiting the insertion of a work piece therein and7 ejecting same therefrom, a piston carried by the member, a cylinder for the piston, hydraulic means for actuating the piston to coractuate the member for ejectpiece from the throat, yielding carried by the member,

ing the wor means for returmng'the member and piston and positive means abutting the piston in opposition to the yielding means to limit the movement of the member under ythe' iniiuence of the yielding means.

5. In a device of the class described the combination with a work support, of means for ejecting the work from the support comprising a member, a piston carried thereby, a cylinder for the piston, a plunger pump, a conduit between the plunger pump and cylinder, an hydraulicmedium contained within the conduit and plunger pump, and means to actuate the pump discharging medium from the pump into the cylinder to actuate the ejector member.

6. In a centerless grinder thecombination 'of opposed grinding and regulatingwheels orminga grinding throat therebetween, a

ing the pump pistonA first cylinder,

support block beneath the grinding throat, a

work rest blade carried by the support block sub-tending the grinding throat, a cylinder carried by the support block, Ia piston within the cylinder, anejector member secured to the piston, a second cylinder. remote from the ders, an hydraulic medium within the second cylinder and conduit-and means for actuatto discharge the hydraulic medium in its cylinder through 'the conduit into the first cylinder to actuate the piston thereinand the jector member carried thereby.

7. In a centerless grinder the combination of opposed grinding and regulating wheels forming a grinding .throat therebetween, a

support block beneath the grinding throat,

a work restblade carried byothe support block y sub-tending the grinding throat, apiston vwithinV the second cylinder,

within the cylinder, an ejector member secured to the piston, a second cylinder remote from the first cylinder, a' pump piston a conduit cnhydraulic v medium necting the cylinders, an

' within the pump cylinder and conduit means for actuating the pump piston to discharge a conduit connecting the cylin-- the hydraulic medium inits cylinder through the conduit into the irst cylinder to actuate the piston therein andthe ejectorv member carried thereby, yielding means returning the pump piston to its orlginal position creating a vacuum sucking into the cylinder thereof the hydraulic medium 'and/yielding means returning the piston in the iirst cylin-v der to itsoriginal position. L

8. In a centerless grinder, the combination ofopposed grinding and regulating wheels forming a grinding throat therebetween, a

duit into the firstvcyhnder to actuate the piston therein and the ejector member carried thereby and means permitting the replenishing of the hydraulic medium within the pump cylinder and the conduit.

9. In aV centerless grinder, the combination of opposed grinding and regulating wheels forming a grinding throat. therebetween, a4 work rest blade within the throat supportingthe work piece during grinding, means operable for causing a relative approach of the grinding` and regulating wheels to eEect a stock removalfrom the work piece, a shift'- able positionin vand ejector "member, hydraulic means or actuatingthe` member to eject a Work ieee, yielding means for returning the member to its initial position, means limiting `the movement of the member under the iniuence of the yielding means to definitely position the member, and a reciprocable pump associated with hydraulic means positively operable in one direction and yielding means for returning the pump to its 1nitial position.

10. In a centerless grinder, the-combination of opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade within the throat supporting A the work piece during grinding, lmeans operable for causing a relative apreturning the pump to its initial osition in the hydraulic circuit and means or replenisliing the medium.

l1. In a device of the class described the 5 combination of a work support, means positioning a work piece on and relative to the work support, an hydraulic plunger pump, a closed hydraulic circuit between the plunger pump and work positioning means, and means for actuating the pump to energize the hydraulic circuit for correspondingly actuating positioning means `to eject the Work piece from the support.

12. In a device of the class described, the combination of a Work support, means positioning a work piece on and relative to the work support, an hydraulic plunger pump, a

closed hydraulic circuit between the plunger pump and work positioningr means, and means for actuating the pump to energize tliehydraulic circuit for correspondingly actuating positioning means to eject the work piece from the support and yielding means for returning the positioning means to its initial position after ejection of thc work piece.

13. In a device of the class described, the combination of a work support, means positioning da work piece on and relative to the work support, -an hydraulic plunger pump, a closed hydraulic circuit between the plunger pump and work positioning means, and means for actuating the pump to energize the hydraulic circuit for correspondingly actuating positioning means toeject the work piece from the support and yielding means formeturning the positioning means to its initial position after ejection of the work piece and means adjusting the initial positionof the positioning means.

10 In testimony whereof I aiiiX my signature.

CECIL W. HOPKINS. 

